`npm i` installs older dependencies

[saschanaz]

Because package.json is not being updated. This can be a hurdle for contributors.

[orta]

Dependabot doesn't seem to be making PRs, https://github.com/microsoft/TypeScript-DOM-lib-generator/pulls?q=is%3Apr+author%3Aapp%2Fdependabot

[ExE-Boss]

Refs #1173 (comment):

Unfortunately https://github.com/OSS-Docs-Tools/code-owner-self-merge does not support partial ownership of package.json 😬 OSS-Docs-Tools/code-owner-self-merge#29